Thanks Mark. Ed, I was tracking the planes and shooting, but I was shooting in shutter priority with my speed at 1/800 or 1/1000. When I am attempting to pan, I use the same tracking motion but lower my speed to 1/160. I do not know if my understanding is right or wrong, but that is my definition.

Excellent series, the B-17s, P-47, and P-51 were my favorites.
I am having trouble with getting the right speed to avoid stopping the props. Looks like something around 1/320 or so. Any suggestions you care to share?